Chain sprocket wheel and chain moving device

Abstract

To provide a chain sprocket wheel which is capable of exchanging only a part of a partial wheel without stopping drive, and in which backlash of the partial wheel to a stationary platen hardly occurs.SOLUTION: The present invention relates to a chain sprocket wheel 1 in which a chain is laid over an outer periphery. The chain sprocket wheel comprises a wheel part 2 including a number of teeth 4 to which the chain is engaged, and a stationary platen 3. The wheel part 2 is divided into a plurality of partial wheels 5 in a circumferential direction. Each of partial wheels 5 is mounted onto the stationary platen 3 in a removable manner by a bolt 8 disposed in a circumferential direction. A projection 11 is formed in any one of composition planes of the stationary platen 3 and the partial wheel 5, and a recess 12a is formed in the other. The projection 11 and the recess 12 are engaged and in the partial wheel 5, the projection 11 or the recess 12b is formed on the composition plane with the stationary platen 3 and on an opposite side of the composition plane and even if the partial wheel 5 is inverted, the same can be mounted onto the stationary platen 3.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a chain sprocket wheel and a chain moving device that move a chain wrapped around its outer periphery in the length direction. [Background technology]

[0002] A chain mechanism used in a typical chain moving device has multiple chain sprocket wheels arranged with a chain stretched around its outer periphery, and at least one of the chain sprocket wheels is rotated by a drive device, transmitting the rotational force to the chain to move it in the longitudinal direction. Since the chain engages with some of the teeth of the chain sprocket wheel, a large load is applied to these teeth, which makes them susceptible to breakage and wear. In particular, in chain conveyors that transport heavy objects and the chain mechanism of sludge collectors, the teeth are subject to severe damage, so the chain sprocket wheel must be replaced frequently. In this case, replacing the entire large chain sprocket wheel not only requires a lot of labor and time, but is also very costly. The same is true for the driven chain sprocket wheel.

[0003] Therefore, Patent Document 1 discloses a chain sprocket wheel that conventionally comprises a wheel body and a fixed plate to which the wheel body is attached and fixed, the wheel body being formed as a split type that is replaceable. If this type of split chain sprocket wheel becomes unusable due to partial tooth loss or wear, it can be repaired by simply replacing some of the segments of the wheel body while the chain is still attached. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-356217 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in a chain sprocket wheel such as that described in Patent Document 1, the split pieces of the wheel body and the fixed plate are attached and fixed only with bolts and nuts, so if a large force is applied to one of the teeth, the split piece will rattle against the fixed plate, and there is a risk that force will not be transmitted sufficiently between the chain. For this reason, in addition to fixing with bolts and nuts, it is also possible to prevent rattling by providing a convex portion on one of the split piece or the fixed plate and a concave portion on the other and engaging the two. On the other hand, the teeth of a chain sprocket wheel may also wear unevenly in one direction relative to the rotational direction. The problem that the present invention aims to solve is to provide a chain sprocket wheel that allows only a part of a partial wheel to be replaced without removing the chain, that is less likely to rattle the partial wheel against the fixed platen, and that can be efficiently dealt with even if the partial wheel wears unevenly. [Means for solving the problem]

[0006] The invention according to claim 1 is a chain sprocket wheel for winding a chain around its outer periphery, comprising a wheel portion having a number of teeth with which the chain engages, a fixed plate having one surface to which the wheel portion is joined, and a plurality of fasteners for joining and fixing the wheel portion to the one surface of the fixed plate, the wheel portion being divided into a plurality of partial wheels in the circumferential direction, each partial wheel being independently detachably attached to the one surface of the fixed plate by at least one or more of the plurality of fasteners, the one or more fasteners detachably fixing only one of the partial wheels to the fixed plate, a convex portion is formed on one of the joining surfaces of the fixed plate and a concave portion is formed on the other, the convex portion and and at least one of the recesses is formed in a circumferential direction, the joint surfaces of the partial wheel are provided on the front and back, and the front and back surfaces are formed with the convex portions or the concave portions, and the partial wheel can be used by moving the partial wheel from the front to the back direction of the fixed platen, with the joint surface of the partial wheel as the back surface, engaging the convex portions and the concave portions, or by flipping the partial wheel over and moving the partial wheel from the front to the back direction of the fixed platen, with the joint surface of the partial wheel as the front, engaging the convex portions and the concave portions, and attaching it to one surface of the fixed platen. The invention of claim 2 is the chain sprocket wheel as described in claim 1, characterized in that the fasteners are multiple, and the circumferential distance between the fasteners in one of the partial wheels is the same as the circumferential distance between the fasteners in the one partial wheel that are located on the side of an adjacent other partial wheel and the fasteners in the other partial wheels that are located on the side of the one partial wheel. The invention according to claim 3 is the chain sprocket wheel according to claim 1 or 2, characterized in that a gap is formed between adjacent partial wheels. The invention according to claim 4 is the chain sprocket wheel according to any one of claims 1 to 3, characterized in that the wheel portion is divided in the circumferential direction through the valley portions of the teeth. The invention according to claim 5 provides a chain moving device comprising a drive chain sprocket wheel, a driven chain sprocket wheel, and a chain wound around the outer periphery of the drive chain sprocket wheel and a front driven chain sprocket wheel, wherein the drive chain sprocket wheel and the driven chain sprocket wheel each comprise a wheel portion having a number of teeth with which the chain engages, and a fixed plate, the wheel portion being divided into a plurality of partial wheels in the circumferential direction, each partial wheel being detachably attached to the fixed plate by a plurality of fasteners arranged in the circumferential direction, a convex portion is formed on one of the joint surfaces of the fixed plate and a concave portion is formed on the other, and the convex portion and the concave portion are engaged with each other, the convex portion or the concave portion is formed on the joint surface with the fixed plate and the opposite surface to the joint surface of the partial wheel, the partial wheel can be attached to the fixed plate even when it is turned over, and the circumferential distance between the fasteners of the partial wheels of the drive chain sprocket wheel and the fasteners of the partial wheels of the driven chain sprocket wheel in the circumferential direction are the plurality of fasteners arranged on each of the partial wheels have a first fastener and a second fastener arranged rearward of the first fastener in the rotational direction of the partial wheel; the drive chain sprocket wheel has a longer distance from the rotation center of the wheel portion on which the first fastener is arranged than the distance from the rotation center of the wheel portion on which the second fastener is arranged; the driven chain sprocket wheel has a shorter distance from the rotation center of the wheel portion on which the first fastener is arranged than the distance from the rotation center of the wheel portion on which the second fastener is arranged; the distance from the rotation center of the wheel portion on which the first fastener is arranged on the drive chain sprocket wheel is the same as the distance from the rotation center of the wheel portion on which the second fastener is arranged on the driven chain sprocket wheel; and the distance from the rotation center of the wheel portion on which the second fastener is arranged on the drive chain sprocket wheel is the same as the distance from the rotation center of the wheel portion on which the second fastener is arranged on the drive chain sprocket wheel;The chain moving device is characterized in that the partial wheels of either the driving chain sprocket wheel or the driven chain sprocket wheel can be attached to the fixed plate of the other by being reversed. As another invention, the following may be also provided. Another invention 1is a chain sprocket wheel for winding a chain around its outer periphery, the chain sprocket wheel comprising: a wheel portion having a number of teeth with which the chain engages; a stationary plate having one surface to which the wheel portion is joined; and a plurality of fasteners for joining and fixing the wheel portion to the one surface of the stationary plate; the wheel portion is divided into a plurality of partial wheels in the circumferential direction, and each partial wheel is independently detachably attached to the one surface of the stationary plate by at least one or more of the plurality of fasteners, and the one or more fasteners detachably fix only one of the partial wheels to the stationary plate, and the fixed plate is This chain sprocket wheel is characterized in that a convex portion is formed on one of the joint surfaces of the platen and the partial wheel, and a concave portion is formed on the other, the joint surfaces of the partial wheel are provided on the front and back, and the convex portion or the concave portion is formed on the front and back, and the partial wheel can be used by attaching it to one side of the fixed platen with the joint surface of the partial wheel as the back surface and engaging the convex portion with the concave portion, or the partial wheel can be flipped over and the joint surface of the partial wheel as the front surface and engaging the convex portion with the concave portion, and attached to one side of the fixed platen. Another invention 2 the fasteners are multiple, and a circumferential distance between the fasteners in one of the partial wheels is equal to a circumferential distance between a fastener in the one partial wheel located on the side of an adjacent other partial wheel and a fastener in the other partial wheel located on the side of the one partial wheel. Another invention 1 2. A chain sprocket wheel according to claim 1 . Another invention 3 The present invention is characterized in that a gap is formed between adjacent partial wheels. Another invention 1 or Another invention 2 2. A chain sprocket wheel according to claim 1 . Another invention 4 The wheel portion is divided in the circumferential direction through the valleys of the teeth. Another invention 1 ~ Another invention 3 1. A chain sprocket wheel according to claim 1, Another invention 5a movable chain device comprising a drive chain sprocket wheel, a driven chain sprocket wheel, and a chain wound around an outer periphery of the drive chain sprocket wheel and a front driven chain sprocket wheel, wherein the drive chain sprocket wheel and the driven chain sprocket wheel each comprise a wheel portion having a number of teeth with which the chain engages, and a fixed plate, the wheel portion being divided into a plurality of partial wheels in the circumferential direction, each partial wheel being detachably attached to the fixed plate by a plurality of fasteners arranged in the circumferential direction, a convex portion is formed on one of the joint surfaces of the fixed plate and the partial wheel, and a concave portion is formed on the other of the joint surfaces, and the convex portion and the concave portion are engaged with each other, the convex portion or the concave portion is formed on the joint surface with the fixed plate and the opposite surface to the joint surface, and the partial wheel can be attached to the fixed plate even when it is turned over, and the distance between the first fastener and the driven chain sprocket wheel is equal to the distance between the first fastener and the driven chain sprocket wheel, the distance between the first fastener and the driven chain sprocket wheel is equal to the distance between the second fastener and the driven chain sprocket wheel, the distance between the first fastener and the driven chain sprocket wheel is equal to the distance between the second fastener and the driven chain sprocket wheel, the distance between the second fastener and the driven chain sprocket wheel is equal to the distance between the second fastener and the driven chain sprocket wheel,The chain moving device is characterized in that the partial wheels of either the driving chain sprocket wheel or the driven chain sprocket wheel can be attached to the fixed plate of the other by being reversed. Also, moreover As another invention, the following may be also provided. Means 1 is a chain sprocket wheel having a chain hung around its outer circumference, the chain sprocket wheel comprising: a wheel portion having a large number of teeth with which the chain engages; and a fixed plate; the wheel portion is divided into a plurality of partial wheels in the circumferential direction, each partial wheel is removably attached to the fixed plate by fasteners arranged in the circumferential direction; a convex portion is formed on one of the joint surfaces of the fixed plate and the partial wheel and a concave portion is formed on the other, and the convex portion and the concave portion are engaged with each other; the partial wheel has the convex portion or the concave portion formed on the joint surface with the fixed plate and the opposite surface to the joint surface, and the partial wheel can be attached to the fixed plate even if it is inverted.

[0007] Means 2 the fasteners are multiple, and a circumferential distance between the fasteners in one of the partial wheels is equal to a circumferential distance between a fastener in the one partial wheel located on the side of an adjacent other partial wheel and a fastener in the other partial wheel located on the side of the one partial wheel. Means 1 2. A chain sprocket wheel according to claim 1 .

[0008] Means 3 The present invention is characterized in that a gap is formed between adjacent partial wheels. Means 1 or Means 2 2. A chain sprocket wheel according to claim 1 .

[0009] Means 4 The wheel portion is divided in the circumferential direction through the valleys of the teeth. Means 1~ Means 3 1. A chain sprocket wheel according to claim 1,

[0010] Means 5a movable chain device comprising a drive chain sprocket wheel, a driven chain sprocket wheel, and a chain wound around an outer periphery of the drive chain sprocket wheel and a front driven chain sprocket wheel, wherein the drive chain sprocket wheel and the driven chain sprocket wheel each comprise a wheel portion having a number of teeth with which the chain engages, and a fixed plate, the wheel portion being divided into a plurality of partial wheels in the circumferential direction, each partial wheel being detachably attached to the fixed plate by a plurality of fasteners arranged in the circumferential direction, a convex portion is formed on one of the joint surfaces of the fixed plate and the partial wheel, and a concave portion is formed on the other of the joint surfaces, and the convex portion and the concave portion are engaged with each other, the convex portion or the concave portion is formed on the joint surface with the fixed plate and the opposite surface to the joint surface, and the partial wheel can be attached to the fixed plate even when it is turned over, and the distance in the circumferential direction between the fasteners of the partial wheels of the drive chain sprocket wheel and the distance in the circumferential direction between the fasteners of the partial wheels of the driven chain sprocket wheel are the distance between the first fastener and the driven chain sprocket wheel is equal to the distance between the first fastener and the driven chain sprocket wheel, the distance between the first fastener and the driven chain sprocket wheel is equal to the distance between the second fastener and the driven chain sprocket wheel, the distance between the first fastener and the driven chain sprocket wheel is equal to the distance between the second fastener and the driven chain sprocket wheel, the distance between the second fastener and the driven chain sprocket wheel is equal to the distance between the second fastener and the driven chain sprocket wheel,The chain moving device is characterized in that the partial wheels of either the driving chain sprocket wheel or the driven chain sprocket wheel can be attached to the fixed plate of the other by being reversed. Effect of the Invention

[0011] According to the present invention, if a malfunction occurs in any of the partial wheels, the partial wheel can be moved to a position where it does not engage with the chain, and only the worn or damaged partial wheel can be easily replaced without removing the chain, thereby making it possible to significantly reduce the effort and cost required for replacement. In addition, since the partial wheel attached by the fastener has a recess and a protrusion formed on the joint surface with the fixed plate engaged with each other, even if a large force is applied to some of the teeth, the partial wheel can be prevented from rattling against the fixed plate. Furthermore, the partial wheel has a convex or concave portion formed on the joint surface with the fixed plate and the opposite surface to the joint surface, so that the partial wheel can be attached by fitting the concave and convex portions to the fixed plate even if it is turned over. By configuring it in this way, if the partial wheel experiences uneven wear (one-sided wear), it can be turned over and attached to the fixed plate, making it possible to significantly reduce running costs. Also, the partial wheel can be shared between the drive chain sprocket wheel and the driven chain sprocket wheel, making it possible to reduce the manufacturing costs of the partial wheel.

[0012] In addition, by making the distance between the fasteners in one partial wheel the same as the distance between the fasteners in one partial wheel located on the side of an adjacent other partial wheel and the fasteners in the other partial wheel located on the side of the one partial wheel, the partial wheels can be easily attached to the fixed platen when the chain sprocket wheel is initially assembled, making it possible to carry out the assembly work efficiently.

[0013] In addition, by forming a gap between the partial wheels arranged adjacent to each other, the partial wheels are prevented from competing with each other, and the partial wheels can be easily attached and detached.

[0014] In addition, since the wheel portion is divided in the circumferential direction through the valleys of the teeth, the contact surface is smaller than when the wheel portion is divided along the peaks, making attachment and detachment easier. [Brief description of the drawings]

[0015] [Figure 1] 1 is a front view of a chain sprocket wheel according to a first embodiment of the present invention; [Diagram 2] 1 is a cross-sectional view of a chain sprocket wheel according to a first embodiment of the present invention. [Diagram 3] FIG. 2 is a front view of a fixed platen according to the first embodiment of the present invention. [Figure 4] FIG. 2 is a front view of a partial wheel according to the first embodiment of the present invention. [Diagram 5] FIG. 6 is a front view of a chain moving device according to a second embodiment of the present invention. [Figure 6] FIG. 5 is a cross-sectional view of a drive chain sprocket wheel according to a second embodiment of the present invention. [Figure 7] FIG. 11 is a front view of a fixed platen according to a second embodiment of the present invention. [Figure 8] FIG. 6 is a front view of a partial wheel according to a second embodiment of the present invention; [Figure 9] 13A to 13C are explanatory views showing attachment and detachment of a partial wheel according to a second embodiment of the present invention. [Figure 10] 13A to 13C are explanatory views showing attachment and detachment of a partial wheel according to a second embodiment of the present invention. [Figure 11] 13A to 13C are explanatory views showing attachment and detachment of a partial wheel according to a second embodiment of the present invention. [Figure 12] 13A to 13C are explanatory views showing attachment and detachment of a partial wheel according to a second embodiment of the present invention. [Figure 13] FIG. 11 is a front view of a chain sprocket wheel according to a third embodiment of the present invention. [Figure 14] 13A to 13C are diagrams for explaining the effects of the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings, etc. It should be noted that the present invention is not limited to the embodiment.

[0017] [First embodiment] A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view of a chain sprocket wheel according to the first embodiment, FIG. 2 is a cross-sectional view of the chain sprocket wheel according to the first embodiment, FIG. 3 is a front view of a fixed platen according to the first embodiment, and FIG. 4 is a front view of a partial wheel according to the first embodiment.

[0018] In the first embodiment, the chain sprocket wheel 1 is a drive chain sprocket wheel, which moves a chain (not shown) stretched around the outer periphery in the length direction. As shown in FIGS. 1 and 2, the chain sprocket wheel 1 includes a wheel portion 2 and a disk-shaped fixed plate 3. The wheel portion 2 has a number of teeth 4 on its outer periphery with which the chain engages, and each tooth 4 has a crest portion 41 and a valley portion 42 .

[0019] The wheel portion 2 is divided into a plurality of (eight in this embodiment) partial wheels 5 at equal intervals in the circumferential direction. The number of divisions may be set so that there is at least one partial wheel 5 with which the chain does not engage even when the chain is wrapped around in a U-turn shape. The wheel unit 2 is divided along a dividing line extending radially through the crest 41 of the tooth 4, and is formed into a disk shape as a whole by combining all the partial wheels 5 in the circumferential direction. In addition, when all the partial wheels 5 are combined, a small gap 7 is formed between adjacent partial wheels 5.

[0020] The partial wheel 5 is detachably fixed to one surface of the fixed platen 3 by a bolt 8 inserted through a bolt hole 9 (see FIG. 3) of the fixed platen 3 and a bolt hole 10 (see FIG. 4) of the partial wheel 5. Two bolts 8 are provided for each partial wheel 5, and these bolts are composed of a first bolt 8a and a second bolt 8b that is disposed rearward of the first bolt 8a in the rotational direction of the partial wheel 5. The bolts 8, the first bolt 8a, and the second bolt 8b correspond to the fastener, the first fastener, and the second fastener of the present invention, respectively.

[0021] 1 and other figures, a first bolt 8a (first fastener) and a second bolt 8b (second fastener) for fixing the partial wheel 5 are disposed concentrically with the rotation center of the wheel portion 2. In other words, the distance from the rotation center of the wheel portion 2 to where the first bolt 8a is disposed is the same as the distance from the rotation center of the wheel portion 2 to where the second bolt 8b is disposed.

[0022] As shown in FIGS. 2 and 3, the fixed platen 3 includes a cylindrical portion 30 for passing a shaft (not shown) therethrough, and a circular flange-shaped wheel fixing portion 31 for mounting the wheel portion 2. As shown in FIG. A fixing flange 32 is formed along the inner peripheral edge of one surface of the wheel fixing portion 31 (the front surface to which the wheel portion 2 is joined), and the inner peripheral surface of the fixing flange 32 is fixed to the outer peripheral surface of the tubular portion 30 by welding or the like.

[0023] As shown in FIGS. 2 and 3, a circular protrusion 11 is formed on one surface of the wheel fixing portion 31 along the entire outer periphery. 2 and 4, recesses 12a, 12b that engage with protrusions 11 of the fixed platen 3 are formed along the circumferential direction on the surface of the partial wheel 5 that is joined to the fixed platen 3. Specifically, recesses 12b are formed on the front surface, and recesses 12a are formed on the rear surface that is currently engaged with protrusions 11. When the inner surface of the partial wheel 5 is abutted against the outer surface of the fixing flange 32, the partial wheel 5 and the fixed plate 3 are positioned radially, the convex portion 11 can be easily engaged with the concave portion 12a or the concave portion 12b, and the bolt holes 9, 10 can also be easily aligned.

[0024] Since the circular projection 11 is formed along the entire outer periphery of the wheel fixing portion 31, the projection 11 can be easily processed. When the chain sprocket wheel 1 is rotated to drive the chain, uneven forces are applied to the teeth 4 of the partial wheel 5, causing the partial wheel 5 to rattle against the fixed platen 3, but the circumferentially extending convex portion 11 of the fixed platen 3 engages with the concave portion 12a or concave portion 12b of the partial wheel 5 to suppress the rattle.

[0025] If uneven wear (one-sided wear) occurs on the partial wheel 5, the bolt 8 is loosened and removed to release the engagement between the recess 12a on the rear side of the partial wheel 5 and the protrusion 11, and then the partial wheel 5 is turned over to engage the recess 12b on the front side with the protrusion 11, i.e., the rear side of the partial wheel 5 is attached to the front side. In this way, uneven wear can be dealt with without replacing the partial wheel with a new one, and running costs can be significantly reduced. Also, if the target partial wheel 5 is positioned on a part where the chain is not stretched and then the work is performed, the work can be performed without removing the chain. Furthermore, if the partial wheel 5 can be made common between the drive chain sprocket wheel and the driven chain sprocket wheel, they can be replaced with each other, and costs can be similarly reduced.

[0026] If any of the partial wheels 5 becomes worn or damaged, it is possible to move the partial wheel 5 to a position where it does not engage with the chain, without removing the chain from the chain sprocket wheel 1, remove the first bolt 8a and the second bolt 8b, remove the worn or damaged partial wheel 5, and install a new partial wheel 5.

[0027] A gap 7 is formed between the adjacently arranged partial wheels 5. Because the gap 7 is formed in this way, when attaching or detaching a partial wheel 5, the partial wheel 5 to be removed does not compete with the adjacent partial wheel 5, and the partial wheel 5 can be easily removed without being hindered by the adjacent partial wheel 5. In addition, the installation work can be performed without being hindered by the adjacent partial wheel 5.

[0028] In this embodiment, the circumferential distance between the bolts in one partial wheel 5 (distance indicated by a in FIG. 1) is different from the circumferential distance between the bolts that fix the one partial wheel 5 located on the side of the adjacent other partial wheel 5 and the bolts that fix the other partial wheel 5 located on the side of the one partial wheel (distance indicated by b in FIG. 1). Therefore, it was necessary to attach the partial wheel at the position indicated by a in FIG. 1. However, the bolt holes 9, 10 may be arranged so that the distance indicated by a and the distance indicated by b in FIG. 1 are the same, that is, the bolts 8 are all arranged at equal intervals in the circumferential direction. With this configuration, for example, when the wheel portion 2 of the chain sprocket wheel 1 is first assembled, the partial wheel 5 can be easily attached from any position on the wheel fixing portion 31, and the assembly work can be performed efficiently.

[0029] Second Embodiment A second embodiment of the present invention will be described below with reference to Figures 5 to 12. Note that a description of the same parts as in the first embodiment will be omitted, and differences will be mainly described.

[0030] Figure 5 is a front view of a chain moving device according to the second embodiment, Figure 6 is a cross-sectional view of a drive chain sprocket wheel according to the second embodiment, Figure 7 is a front view of a fixed platen according to the second embodiment, Figure 8 is a front view of a partial wheel according to the second embodiment, and Figures 9 to 12 are explanatory views showing the installation and removal of the partial wheel according to the second embodiment.

[0031] Figure 5 shows a chain moving device. The upper chain sprocket wheel 1 is a drive chain sprocket wheel, and the lower chain sprocket wheel 1 is a driven chain sprocket wheel. The chain that is stretched over is not shown in the figure, and the arrows indicate the rotation direction of each chain sprocket wheel and the moving direction of the chain.

[0032] The upper chain sprocket wheel 1 on the driving side is similar to that of the first embodiment, but the attachment positions of the first bolt 8a and the second bolt 8b from the rotation center of the wheel portion 2 are different. In other words, the distance from the rotation center of the wheel portion 2 to where the first bolt 8a is arranged and the distance from the rotation center of the wheel portion 2 to where the second bolt 8b is arranged are different. By arranging the wheels in this manner, even if a large force is applied to the teeth 4 in the moving direction of the chain, rattling of the partial wheels 5 with respect to the fixed platen 3 can be prevented more effectively.

[0033] Specifically, the distance from the rotation center of the wheel part 2 to the first bolt 8a is set to be longer than the distance from the rotation center of the wheel part 2 to the second bolt 8b (FIGS. 5 and 6). For this reason, the bolt holes 9, 10 provided in the fixed platen and the partial wheel 5 are also arranged accordingly (FIGS. 7 and 8). As a result, since it is a drive chain sprocket wheel, it is possible to increase the resistance to the rotational moment acting on the opposite side of the rotational direction of the partial wheel 5 from the chain generated by the rotation of the chain sprocket wheel 1, thereby preventing rattling.

[0034] The lower chain sprocket wheel 1, which is the driven side, is similar to the upper chain sprocket wheel, but the attachment positions of the first bolt 8a and the second bolt 8b are different. Specifically, the bolts 8 are arranged so that the distance from the center of rotation of the wheel portion 2 to which the first bolt 8a is arranged is shorter than the distance from the center of rotation of the wheel portion 2 to which the second bolt 8b, which is arranged rearward in the rotation direction of the wheel portion 2 from the first bolt 8a.

[0035] The lower chain sprocket wheel 1, which is the driven side, rotates in the direction of the arrow as a chain (not shown) stretched around its outer circumference moves, and therefore a rotational moment acts on the partial wheel 5 of the chain sprocket wheel 1 in the rotational direction of the partial wheel from the chain, which is generated by the movement of the chain. In response to this, by arranging the first bolt 8a and the second bolt 8b as described above, it is possible to increase the resistance to the rotational moment acting in the rotational direction of the partial wheel 5 from the chain caused by the movement of the chain.

[0036] The distance from the center of rotation of the wheel portion 2 at which the first bolt 8a is positioned in the upper chain sprocket wheel 1 is the same as the distance from the center of rotation of the wheel portion 2 at which the second bolt 8b is positioned in the lower chain sprocket wheel 1, and the distance from the center of rotation of the wheel portion 2 at which the second bolt 8b is positioned in the upper chain sprocket wheel 1 is the same as the distance from the center of rotation of the wheel portion 2 at which the first bolt 8a is positioned in the lower chain sprocket wheel 1.

[0037] The circumferential distance between the bolts in the partial wheels 5 of the upper chain sprocket wheel 1 (the distance indicated by a in Figure 5) is the same as the circumferential distance between the bolts in the partial wheels 5 of the lower chain sprocket wheel 1 (the distance indicated by a in Figure 5).

[0038] In addition, the circumferential distance between the bolt that secures one of the partial wheels 5 of the upper chain sprocket wheel 1 and the bolt that secures the other partial wheel 5 and the bolt that secures the other partial wheel 5 and the one partial wheel side (distance indicated by b in Figure 5) is the same as the circumferential distance between the bolt that secures one of the partial wheels 5 of the lower chain sprocket wheel 1 and the bolt that secures the other partial wheel 5 and the bolt that secures the other partial wheel 5 and the one partial wheel side (distance indicated by b in Figure 5).

[0039] A method for dealing with the case where uneven wear occurs in the partial wheel 5 will be described with reference to FIGS. In Figures 9 to 12, the two lower partial wheels 5a, 5b of the upper chain sprocket wheel 1 and the two upper partial wheels 5c, 5d of the lower chain sprocket wheel 1 are partial wheels 5 in a position where a chain (not shown) is not engaged.

[0040] As shown in Fig. 9, the left partial wheel 5a of the two lower partial wheels of the upper chain sprocket wheel 1 and the right partial wheel 5c of the two upper partial wheels of the lower chain sprocket wheel 1 are removed from the fixed platen 3. The method of removal is the same as in the first embodiment.

[0041] 10, the removed partial wheels 5a, 5c are each inverted, replaced, and attached to the fixed plate 3. Specifically, the rear sides of the partial wheels 5a, 5c are turned to the front side, the recesses 12b formed on the front side are engaged with the protrusions 11 of the fixed plate 3 to which they will be replaced, and the bolt holes 9, 10 are aligned and joined with bolts (not shown). In this way, the partial wheels 5a, 5c of the upper chain sprocket wheel 1 on the driving side and the lower chain sprocket wheel 1 on the driven side can be mounted on the other fixed platen 3 with the wheels inverted relative to each other.

[0042] Next, as shown in FIG. 11, the right-hand partial wheel 5b of the two lower partial wheels of the upper chain sprocket wheel 1 and the left-hand partial wheel 5d of the two upper partial wheels of the lower chain sprocket wheel 1 are removed from the fixed platen 3.

[0043] 12, the removed partial wheels 5b, 5d are each inverted, replaced, and attached to the fixed plate 3. Specifically, the rear sides of the partial wheels 5b, 5d are turned to the front side, the recesses 12b formed on the front side are engaged with the protrusions 11 of the fixed plate 3 to which they will be replaced, and the bolt holes 9, 10 are aligned and joined with bolts (not shown). In this way, the partial wheels 5b, 5d of the upper chain sprocket wheel 1 on the driving side and the lower chain sprocket wheel 1 on the driven side can be mounted on the other fixed platen 3 by being inverted with respect to each other.

[0044] Then, the chain sprocket wheel is rotated and the partial wheel to be replaced next is moved to a position where it is not engaged with the chain, and the same operation as above is repeated.

[0045] Third embodiment A third embodiment of the present invention will be described below with reference to Figures 13 and 14. Note that a description of the same parts as in the first and second embodiments will be omitted, and differences will be mainly described. Figure 13 is a front view of the chain sprocket wheel 1 according to the third embodiment, showing the drive chain sprocket wheel 1.

[0046] In the third embodiment, the wheel part 2 is divided into a plurality of partial wheels 5 along dividing lines extending radially through the valleys 42 of the teeth 4 . When the wheel section 2 is divided at the valleys 42 of the teeth 4 in this way, the strength is somewhat lower and the partial wheels 5 are more likely to separate than when divided at the peaks 41, but since there are fewer parts that can come into contact with the adjacent partial wheels 5 when attaching or detaching, the adjacent partial wheels 5 do not get in the way and attachment and detachment are easier. Also, since there are fewer parts that can come into contact with the adjacent partial wheels 5 when attaching or detaching, there is less chance of fingers getting pinched, allowing for safe attachment and detachment work.

[0047] The eight attached partial wheels 5 are provided so as to be flush with the joint surface of the wheel fixing part 31, but there are cases where a step is generated between adjacent partial wheels 5 when attaching and detaching them. Even in such a case, if the partial wheels 5 are divided along a dividing line extending radially through the valley portion 42 of the tooth 4, the effect of the step on the movement of the chain can be reduced, contributing to the smooth movement of the chain. This effect will be specifically explained with reference to FIG. 14. Figure 14 is a diagram for explaining this effect, where Figure 14(a) is an enlarged plan view of the portion of the wheel portion 2 divided by the crest portion 41 of the tooth 4 (as viewed from direction A in Figure 5), and Figure 14(b) shows the third embodiment and is an enlarged plan view of the portion of the wheel portion 2 divided by the valley portion 42 of the tooth 4 (as viewed from direction B in Figure 13).

[0048] Regarding the distance of the divided peaks 41 from the step Z when adjacent partial wheels 5, 5 arranged with a gap 7 between them are divided by the peaks 41 of the teeth 4 as shown in Fig. 14(a), the distance of the divided peaks 41 is L1 of the gap 7. On the other hand, in the case where the partial wheels 5, 5 are divided by the valleys 42 of the teeth 4 as shown in Fig. 14(b), the distance of the divided peaks 41 is L2, which is larger than the gap 7 by the valleys 42, 42, and in the case where the partial wheels 5, 5 are divided by the valleys 42, the distance over which the same step Z of the peaks 41 occurs is longer. For this reason, the effect of the step of the peaks 41 on the chain is relatively smaller in the case of Fig. 14(b) where the chain is divided by the valleys 42. Moreover, in the case of Fig. 14(a) where the chain is divided by the peaks 41, a step Z occurs between the peaks 41 that engage with one hole in the chain, but in the case of Fig. 14(b) where the chain is divided by the valleys 42, a step Z occurs between the peaks 41 that engage with two holes in the chain, and the effect of the step on the chain is smaller.

[0049] [Other Modifications] The present invention is not limited to the above-mentioned embodiment, and may also include the following, for example.

[0050] In this embodiment, the wheel portion is divided into eight partial wheels, but the number of divisions can be changed as appropriate depending on the size of the chain sprocket wheel, the angle at which the chain engages, etc.

[0051] In this embodiment, the fixed platen is formed with a convex portion and the partial wheels are formed with a concave portion. However, it is of course possible to form a concave portion on the fixed platen and a convex portion on the partial wheels.

[0052] In this embodiment, the circular convex portion 11 is formed along the entire outer periphery of the wheel fixing portion 31, but this is not limited to this. It may be provided intermittently rather than along the entire outer periphery. Also, the convex portion may be formed on the inner joint surface rather than on the outer periphery. The shape of the convex portion is also not limited to the embodiment. In this embodiment, it is provided so as to be curved in the circumferential direction, but it may be a polygonal shape or one that is elongated in the radial direction as long as it can be inverted and attached to and detached from the fixed platen.

[0053] In this embodiment, each partial wheel is attached to the fixed platen by two bolts, a first bolt and a second bolt, but this is not limited thereto, and each partial wheel may be attached to the fixed platen by a single bolt.

[0054] In this embodiment, each partial wheel is attached to the fixed platen by two bolts, a first bolt and a second bolt, but depending on the size of the partial wheel, it may be attached by three or more bolts.

[0055] In this embodiment, the installation and removal of the partial wheel corresponding to the uneven wear is explained while the chain is attached, but the chain may be removed to perform the installation and removal. In this case, the wheel part can be installed and removed at any position without rotating.

[0056] Each technical matter in any embodiment may be applied to another embodiment to serve as an example. [Explanation of symbols]

[0057] 1 Chain sprocket wheel 2 Wheel section 3 Fixed plate 4 Teeth 5 Part Wheel 7. Gap 8 Volts 8a First bolt (first fastener) 8b Second bolt (second fastener) 9, 10 Bolt holes 11 Convex 12a, 12b Recess 30 Cylindrical part 31 Wheel fixing part 32 Fixing flange

Claims

1. A chain sprocket wheel having a chain wound around its outer periphery, a wheel portion having a large number of teeth with which a chain engages, a stationary plate having a surface to which the wheel portion is joined, and a plurality of fasteners for joining and fixing the wheel portion to the surface of the stationary plate, The wheel portion is divided into a plurality of partial wheels in a circumferential direction, and each partial wheel is independently detachably attached to the one surface of the fixed platen by at least one or more fasteners among the plurality of fasteners, the one or more fasteners removably fasten only one of the partial wheels to the fixed platen; A convex portion is formed on one of the joint surfaces of the fixed platen and the partial wheel, and a concave portion is formed on the other of the joint surfaces of the fixed platen and the partial wheel, At least one of the convex portion and the concave portion has a shape formed along a circumferential direction, The joint surfaces of the partial wheel are provided on the front and back surfaces, and the protrusions or recesses are formed on the front and back surfaces. The partial wheel can be attached to one surface of the fixed plate by moving the partial wheel from the front to the back surface of the fixed platen with the joint surfaces of the partial wheel as the back surface, engaging the protrusions and the recesses, or the partial wheel can be inverted and attached to one surface of the fixed platen by moving the partial wheel from the front to the back surface of the fixed platen with the joint surfaces of the partial wheel as the front surface, engaging the protrusions and the recesses, and using the partial wheel. A chain sprocket wheel characterized by:

2. The fasteners are plural, 2. The chain sprocket wheel according to claim 1, wherein the circumferential distance between the fasteners in one of the partial wheels is the same as the circumferential distance between the fasteners in the one partial wheel located on the side of an adjacent other partial wheel and the fasteners in the other partial wheel located on the side of the one partial wheel.

3. 3. The chain sprocket wheel according to claim 1, wherein a gap is formed between adjacent partial wheels.

4. 4. A chain sprocket wheel according to claim 1, wherein the wheel portion is divided in the circumferential direction through the valleys of the teeth.

5. A chain moving device comprising a drive chain sprocket wheel, a driven chain sprocket wheel, and a chain wound around an outer periphery of the drive chain sprocket wheel and a leading driven chain sprocket wheel, Each of the drive chain sprocket wheel and the driven chain sprocket wheel includes a wheel portion having a number of teeth with which a chain engages, and a fixed platen; The wheel portion is divided into a plurality of partial wheels in a circumferential direction, and each partial wheel is detachably attached to the fixed platen by a plurality of fasteners arranged in the circumferential direction; A convex portion is formed on one of the joint surfaces of the fixed platen and the partial wheel, and a concave portion is formed on the other of the joint surfaces, and the convex portion and the concave portion are engaged with each other, The partial wheel has a joint surface with the fixed platen and a surface opposite to the joint surface, and the partial wheel can be attached to the fixed platen even when the partial wheel is inverted, the circumferential distance between the fasteners of the partial wheels of the drive chain sprocket wheel is equal to the circumferential distance between the fasteners of the partial wheels of the driven chain sprocket wheel; The plurality of fasteners arranged on each of the partial wheels include a first fastener and a second fastener arranged rearward of the first fastener in a rotational direction of the partial wheel, In the drive chain sprocket wheel, the distance from the rotation center of the wheel portion to which the first fastener is disposed is longer than the distance from the rotation center of the wheel portion to which the second fastener is disposed; the driven chain sprocket wheel is arranged such that a distance from a rotation center of the wheel portion to which the first fastener is disposed is shorter than a distance from a rotation center of the wheel portion to which the second fastener is disposed; a distance from a rotation center of the wheel portion to which the first fastener is disposed in the drive chain sprocket wheel is the same as a distance from a rotation center of the wheel portion to which the second fastener is disposed in the driven chain sprocket wheel; a distance from a rotation center of the wheel portion to which the second fastener is disposed in the drive chain sprocket wheel is the same as a distance from a rotation center of the wheel portion to which the first fastener is disposed in the driven chain sprocket wheel; The partial wheels of either the driving chain sprocket wheel or the driven chain sprocket wheel can be mounted on the fixed platen of the other by being inverted with respect to each other. A chain moving device comprising:

Images